That anomaly is more or less all that remains of what the map evidence suggests was once a substantial enclosure.

The Ordnance Survey's first edition six-inch map, surveyed in 1839, records a circular enclosure roughly 35 metres in diameter at this spot. Circular enclosures of this kind are among the most common archaeological monuments in Ireland, most often interpreted as the enclosed farmsteads of early medieval families, known as raths or ringforts, defined by an earthen bank and internal ditch. A field boundary running northwest to southeast along the western side of the enclosure even kinks outward slightly to accommodate it, which is exactly the kind of small cartographic clue that suggests the feature was real and respected as a boundary marker by those farming around it. By the time the revised Ordnance Survey edition appeared in 1900, however, the enclosure had been replaced on the map by a quarry symbol, implying that in the intervening six decades the earthwork had been deliberately dug out, perhaps for stone or for the levelling of the land. When the site was examined in 1987, the quarry itself had been infilled, the hollow filled back in and grassed over, with only the clustering of trees and scrub marking where something once stood and was then taken apart and covered over.